They will breed at a few months old, not long after they are sexable. Either will do, I use 1/2 coconuts, but small clay pots or clay saucers are fine. The notch entrance needs to be fairly small, and the ceiling fairly low.at what size will they start to breed?" and "should i use caves or small flower pots"
With apologies I'll pinch Mike question, the male can fan his milt into the cave, this is partially why you need a low ceiling. You can see see the male, in front of the cave "shimmying", with all his fins erect and then pulsing his body towards the cave entrance (and presumably releasing his sperm as he does it).Mike how can the male fertilize the eggs if he can't get into the cave?